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Does using multiple magnets around the perimeter of an opening increase the overall pull force to remove the filter?

No.  Using multiple magnets around the perimeter doesn’t accumulate the pull force – it will still fall within the 17 – 18 lbs of pull force to release the track frame away from the contact point. However, using multiple magnets around the perimeter  distributes the weight across all of the magnets so the weight load is reduced to each magnetic point of connection.

It’s important to keep in mind that the purpose of the  Magna-Track frame is to establish a fastening point for the filter – once the Magna-Track frame has been attached to the unit it isn’t necessary to remove it when removing the filter – To remove the filter, simply unfasten the quick release twist lock fasteners and remove the filter away from the Magna-Track Frame – This is particularly recommended on large filter installations.